# Application of a System Using an Augmented Matrix on the TI84 (2×2) Investment

This video explains how to put an augmented matrix is row echelon form and reduced row echelon form on the TI84.

# Application of a System Using an Augmented Matrix on the TI84 (2×2) Sales

This video explains how to put an augmented matrix is row echelon form and reduced row echelon form on the TI84.

# Ex 2: Inverse of a 3×3 Matrix Using an Augmented Matrix

This video explains how to find the inverse of a 3×3 matrix using an augmented matrix.

# Ex 1: Inverse of a 3×3 Matrix Using an Augmented Matrix

This video explains how to find the inverse of a 3×3 matrix using an augmented matrix.

# Ex: Inverse of a 2×2 Matrix Using an Augmented Matrix

This video explains how to find the inverse of a 2×2 matrix using an augmented matrix.

# Ex: Determinant of a 2×2 Matrix

This video provides two examples of calculating a 2×2 determinant.  One example contains fractions.

# Ex 2: Determinant of 3×3 Matrix – Cofactor Method

This video provides an example of how to calculate the determinant using the cofactor method.